Amit and Sujit together can complete an assignment of data entry in 5 days. Sujit's speed is 80% of Amit's speed and the total key depressions in the assignment are 5,76,000. What is Amit's speed in key depressions per hour if they work for 8 hours a day ?

A) 4800

B) 6400

C) 8000

D) 7200

E) None of these

Correct answer:
C) 8000

Description for Correct answer:
Ratio between work done by Amit and Sujit = 100:80 = 5:4

Total work done by Amit = \( 576000 \times \frac{5}{9} \) = 320000

Total working hours by Amit = \(8\times5 \)=40 hr

Amit's speed = \( \frac{320000}{40}=8000 \)

Please provide the error details in above question

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